usr/src/cmd/learn/start.c

#include "stdio.h"
#include "lrnref"
#define ND      64

start(lesson)
char *lesson;
{
        struct direct {
                int inode;
                char name[14];
        };
        struct direct dv[ND], *dm, *dp;
        int f, c, n;
        char where [100];

        f = open(".", 0);
        n = read(f, dv, ND*sizeof(*dp));
        n /= sizeof(*dp);
        if (n==ND)
                fprintf(stderr, "lesson too long\n");
        dm = dv+n;
        for(dp=dv; dp<dm; dp++)
                if (dp->inode) {
                        n = strlen(dp->name);
                        if (dp->name[n-2] == '.' && dp->name[n-1] == 'c')
                                continue;
                        c = dp->name[0];
                        if (c>='a' && c<= 'z')
                                unlink(dp->name);
                }
        close(f);
        if (ask)
                return;
        sprintf(where, "../../%s/L%s", sname, lesson);
        if (access(where, 04)==0)       /* there is a file */
                return;
        fprintf(stderr, "No lesson %s\n",lesson);
        wrapup(1);
}

fcopy(new,old)
char *new, *old;
{
        char b[512];
        int n, fn, fo;
        fn = creat(new, 0666);
        fo = open(old,0);
        if (fo<0) return;
        if (fn<0) return;
        while ( (n=read(fo, b, 512)) > 0)
                write(fn, b, n);
        close(fn);
        close(fo);
}